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G. R. BROBEGK 8: L. D. LEWIS.

GRAVITY LOOK.

No. 572,628. Patented'Dec. 8, 1896.

. W mmnliii (Ioeorg 81731-006076 JlE ewbs UNITE STATES PATENT OFFICE.

GEORGE R. BROBECK AND LEE D. LEWIS, OF TULSO, INDIAN TERRITORY.

G RAVlTY-LOCK.

SPECIFICATION forming part of Letters Patent No. 572,628, dated December8, 1896.

Application filed February 20, 1896. Serial No. 580,056. (No model.)

To all whom it 'may concern.-

Be it known that we, GEORGE R. BROBECK and LEE D. LEWIS, citizens of theUnited States, residing at Tulso, Creek Nation, Indian Territory, haveinvented a new and useful Gravity-Lock, of which the following is aspecification. 1

Our invention relates to gravity-locks, and has for its object toprovide a simple and efficient construction and arrangement of parts toinsure the accuracy of movement of the latch and bolt.

Further objects and advantages of this invention will appear in thefollowing description, and the novel features thereof will beparticularly pointed out in the appended claims.

In the drawings, Figure 1 is a view of a lock constructed in accordancewith our invention, the front plate of the casing being omitted. Fig. 2is a similar View showing the latchbolt-operatin g weight partly brokenaway.

Fig. 3 is a transverse section on the line 3 3 of Fig. 1. Fig. 4 is adetail view in perspective of the latch-bolt. Fig. 5' is a similar viewof the weight. Fig. 6 is a similar view of the gravity-tumbler.

Similar numerals of reference indicate corresponding parts in all thefigures of the drawlugs.-

1 designates a casing provided at its front end with bolt-openings 2 and3, through which project the noses of latch and lock bolts 4 and 5, thelocking-bolt being longitudinally slotted at 6 to receive and slide upona guide and stop pin 7, which is fixed to the casing. Pivotally mountedupon and carried by the locking-bolt is a gravity-tumbler 8, providedwith a plurality of notches 9 and 10 to engage said stop-pin 7 in thedifferent positions of the locking-bolt to prevent accidentaldisplacement. This tumbler is provided at its front or pivotal end withan opening 11 to receive a laterally-projecting pivot-pin 12, which isfixed to the bolt, displacement of the tumbler from the pin beingprevented by the side of the casing. A keyhole 13 is formed in theside'of the casing, and the bolt and tumbler arecut away, as at 14 and15, respectively, to form notches in which the ward of the key operates.

In rear of the locking-bolt we employ an adjustable stop 16, having astem 17 which projects through a slot 18 in the end of the easing andterminates in an exposed head 19, by which the stop may be arranged ineither the elevated or looking position (shown in Fig. 1) or thedepressed or releasing position, (shown in Fig. 2,) said stop being heldin the latter position by means of a supporting-shoulder 20.

The latch-bolt is provided with a thin web or tongue 21 which fitsbetween side or cheek plates 22, formed by cutting a parallel-sidedlongitudinal cavity 23 in the Weight 24, said weight being of athickness corresponding, approximately, with the interval between thecontiguous or inner surfaces of the side plates of the casing. Said webor tongue of the latch-bolt is longitudinally slotted, as at 25, tooperate upon a guide-pin 26, which is rigid with the casing, and theweight is provided with an upwardly and rearwardly inclined guide-slot27, which also receives said guidepin to cause rearward movement of theweight as it is elevated. The means for elevating the weight, in theconstruction illustrated, consists of a rotary retracting device 28,having a hub mounted in opposite registering bearings in the side platesof the casing, and

operating-arms 29, which are arranged between the planes of the checksof the plate and are adapted toengage shoulders 30 to communicate motionto the weight.

The latch-bolt 4 is held from vertical move ment and is guided inlongitudinal movement by the above-described slot 25 and pin 26, and theconnection between the weight and said bolt whereby the extension andretraction of the bolt are accomplished consists of a connecting-pin 31,which engages a vertical or transverse slot 32 in the web or tongue ofthe bolt. Hence the weight, which has an upward and rearward movement,communicates rearward movement to the latch-bolt without impartinglateral movement thereto, and the downward tendency of the weight, whenthe retracting device is released, causes the extension of thelatch-bolt.

The hub of the retracting device is provided with the usualcross-sectionally angular socket for the reception of the spindle 34 ofa knob.

. From the above description it will be seen that the construction ofthe improved lock is V simple, the parts being so connected as toprovide for their operation with accuracy and certainty without the useof springs, and it will be understood that various changes in the form,proportion, and the minor details of construction may be resorted towithout departing from the spirit or sacrificing any of the advantagesof this invention.

Having described our invention, what we claim isp 1. The combinationwith a casing, of a latchbolt mounted for longitudinal sliding movement,an operating-weight mounted to' slide obliquely with relation to thebolt and having a pin operating in a transverse slot in the bolt,whereby downward movement of the weight causes the extension of thebolt, and means, adapted to be manually operated, for elevating theweight and thereby retracting the bolt, substantially as specified.

2. The combination with a casing, of a latchbolt mounted to slidelongitudinally, a weight provided with parallel-spaced cheeks betweenwhich the inner extremity of said bolt is arranged, a pin carried by theweight to engage a transverse slot in the bolt, and means for impartingupward and rearward movement in. an inclined direction to the weight toretract the bolt, substantially as specified.

The combination with a casing, of a weight mounted for upwardly andrearwardly inclined movement, a guide-pin fixed to the casing beingarranged to project through an upwardly and rearwardly inclined slot insaid weight, and the weight being centrally cut away or recessed to formopposite parallel cheeks, a bolt having a reduced web or tongue arrangedbetween said cheeks of the weight and slotted longitudinally to receivesaid guide-pin, a second pin carried by the weight and fitting in atransverse slot in the web or tongue of the bolt, and means forcommunicatin g upward and rearward movement to the weight to retract thebolt, substantially as specified.

In testimony that we claim the foregoing as our own we have heretoaffixed our signatures in the presence of two witnesses.

GEO. R. BROBECK. LEE D. LEWIS. \Vitnesses:

F. R. INTERs, T. J. WILsQN.

